Armchair



FIG. 1 is a perspective view of an armchair;

FIG. 2 is a front elevational view of the armchair;

FIG. 3 is a rear elevational view of the armchair;

FIG. 4 is a right side elevational view of the armchair;

FIG. 5 is a left side elevational view of the armchair; and,

FIG. 6 is a top plan view of the armchair.

CLAIM The ornamental design for an armchair, as shown and described.